A Chicago mother was left distraught and threatening suicide after she witnessed a gunman shoot and kill two of her sons at the restaurant she worked.

Chicago police said that the deadly shooting happened Thursday afternoon at the Nadia Fish and Chicken on 75th street and Coles Avenue when an unidentified man walked into the eatery and started firing.

There were a total of four victims; two of whom were brothers.

The victims’ grandmother, Georgia Jackson, cries after finding out her grandsons were fatally shot.

(Chris Sweda/AP)

Dillon Jackson, 20, was found dead outside the restaurant and his 19-year-old brother Raheem was found slumped against a tree near the eatery. Two other victims, Emmanuel Stokes, 28, and Edwin Davis, 32, died inside Nadia Fish and Chicken.